(countable) A very small unit of weight, in England equal to 1/480 of an ounce troy, 0.0648 grams or, to be more exact, 64.79891 milligrams (0.002285714 avoirdupois ounce). A carat grain or pearl grain is 1/4 carat or 50 milligrams. The old French grain was 1/9216 livre or 53.11 milligrams, and in the mesuresusuelles permitted from 1812 to 1839, with the livre redefined as 500 grams, it was 54.25 milligrams.

(countable) A former unit of gold purity, also known as carat grain, equal to 1⁄4 "carat" (karat).

(materials) A region within a material having a single crystal structure or direction.

A reddish dye made from the coccus insect, or kermes; hence, a red color of any tint or hue, as crimson, scarlet, etc.; sometimes used by the poets as equivalent to Tyrian purple.

Milton

all in a robe of darkest grain

Quoted by Coleridge, preface to Aids to Reflection

[…] doing as the dyers do, who, having first dipped their silks in colours of less value, then give them the last tincture of crimson in grain.

The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout#Translations.